Recent progress in high efficiency polymer solar cells by rational design and energy level tuning of low bandgap copolymers with various electron-withdrawing units

Jae Woong Jung, Jea Woong Jo, Eui Hyuk Jung, Won Ho Jo

Research output: Contribution to journalReview articlepeer-review

95 Citations (Scopus)

Abstract

This review collects recent five-year publications on low bandgap semiconducting polymers, which are composed of electron donor (D) and electron acceptor (A) units, exhibiting the power conversion efficiency (PCE) higher than 6%. When the photovoltaic performances of different types of D-A semiconducting copolymers are compared after the copolymers are classified into several categories according to the type of A-units, it is realized that diketopyrrolopyrrole (DPP)-based copolymers exhibit high JSCs owing to low bandgaps and low VOCs due to high-lying HOMO levels, while thienopyrroledione (TPD)-based copolymers exhibit high VOCs due to their deep HOMO levels and low JSCs because of wide bandgaps. Benzothiadiazole- and thienothiophene-based copolymers show intermediate values of VOC and JSC between DPP- and TPD-based ones. For further enhancement of photovoltaic performance, DPP-based copolymers may be designed to have deeper HOMO level with the minimum widening of bandgap while TPD-based polymers may be designed to have lower bandgap with the minimum rise of HOMO level. Hence, the energy level tuning must be considered so as to minimize the adverse effect.

Original languageEnglish
Pages (from-to)149-170
Number of pages22
JournalOrganic Electronics
Volume31
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • Electron-withdrawing group
  • Low bandgap copolymer
  • Polymer solar cell
  • Rational design

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